<!DOCTYPE html>
<html>
  <body />

  <script>
    const audio = document.createElement('audio');
    audio.src = '../bear-320x240-audio-only.webm';

    const video = document.createElement('video');

    async function start() {
      const canvas = document.createElement('canvas');
      canvas.getContext('2d').fillRect(0, 0, canvas.width, canvas.height);
      video.srcObject = canvas.captureStream();
      video.muted = true;

      await audio.play();
      await video.play();
      await video.requestPictureInPicture();
      return true;
    }

    function setMediaSessionPlayActionHandler() {
      navigator.mediaSession.setActionHandler("play", _ => {
        audio.play();
        video.play();
      });
    }

    function setMediaSessionPauseActionHandler() {
      navigator.mediaSession.setActionHandler("pause", _ => {
        audio.pause();
        video.pause();
      });
    }

    function addPlayEventListener() {
      video.addEventListener('play', _ => {
        document.title = 'play';
      }, { once: true });
    }

    function addPauseEventListener() {
      video.addEventListener('pause', _ => {
        document.title = 'pause';
      }, { once: true });
    }

  </script>
</html>
